Table I.
The characteristic of studies were included in the meta-analysis of preterm labor prevalence in Iran
| Reference | Year | Study location | Sample size (n) | Prevalence (%) |
|---|---|---|---|---|
| Afrakhteh M et al. (4) | 1995-1999 | Tehran | 5628 | 7.23 |
| Rajaeefard A et al. (19) | 2009 | Shiraz | 1117 | 8.3 |
| Lotf Alizadeh M et al. (20) | 2002-2003 | Mashhad | 1979 | 16.4 |
| Bayat-Mokhtary M et al. (21) | 2007 | Mashhad | 17129 | 6.1 |
| Ganji T et al. (22) | 2005 | Qom | 1237 | 13.9 |
| Khalaji Nia Z, Sadeghi Moghadam P. (23) | 2007 | Qom | 10913 | 5.6 |
| Marsusi V et al. (24) | 1996 | Tehran | 1969 | 9.43 |
| Sehati Shaghaie F et al. (25) | 2009 | Ardabil | 3575 | 13.4 |
| Sohrabi D, Ghanbari Gorkani M. (26) | 2007 | Zanjan | 4528 | 7.0 |
| Mansourghanaei M. (27) | 1999-2009 | Rasht | 62841 | 5.99 |
| Amini L et al. (17) | 2009 | Tehran | 990 | 30.4 |
| Alijahan R et al. (28) | 2010-2011 | Ardabil | 6705 | 5.1 |
| Pasdar Y et al. (18) | 2010 | Kermanshah | 32450 | 2.0 |
| Nabavizadeh SH et al. (12) | 2010 | Yasuj | 5400 | 2.4 |